響應編碼（不能改變響應編碼）

Question

public class FeedUpdaterServlet extends HttpServlet { 
public void doGet(HttpServletRequest req, HttpServletResponse resp) 
     throws IOException { 
    PrintWriter out = resp.getWriter(); 
    req.setCharacterEncoding("utf-8"); 
    resp.setLocale(Locale.TAIWAN); 
    resp.setContentType("text/html; charset=utf-8"); 
    resp.setCharacterEncoding("utf-8"); 
    resp.getWriter().println("Hello, world!!@!"); 
      out.println("我是人"); //some chinese character 
    out.println(resp.getCharacterEncoding()); 
    out.flush(); 
    out.close(); 
    } 

} 

網站XML

<locale-encoding-mapping-list> 
     <locale-encoding-mapping> 
      <locale>zh_TW</locale> 
      <encoding>utf-8</encoding> 
     </locale-encoding-mapping> 
    </locale-encoding-mapping-list> 

輸出： 你好，世界！@！ ??? ISO-8859-1

看來，響應的編碼不能改變，發生了什麼？

Answer 1

ServletResponse.setContentType(..)的文檔明確指出，如果在調用getWriter()方法後調用此方法，則該方法無效。

該做的伎倆：

public void doGet(HttpServletRequest req, HttpServletResponse resp) 
     throws IOException { 
    resp.setContentType("text/html; charset=UTF-8"); 
    PrintWriter out = resp.getWriter(); 
    out.println("Hello, world!!@!"); 
    out.println("我是人"); //some chinese character 
    out.println(resp.getCharacterEncoding()); 
    out.flush(); 
    out.close(); 
}